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reference designLTC3644-2

Analog Devices LTC3644-2

Quad 17V, 1.25A Parallelable Synchronous StepDown Regulator with Ultralow Quiescent Current

Overview

TopologyBuck Converter
Input voltage5-17 V
Output 11.8 V / 1.25 A
Output 25 V / 1.25 A
Output 32.5 V / 1.25 A
Output 43.3 V / 1.25 A

Description

The LTC®3644/LTC3644-2 is a quad 1.25A output, high efficiency synchronous monolithic step-down regulator capable of operating from input supplies up to 17V. The switching frequency is internally fixed to 1MHz or 2.25MHz with a ±50% synchronization range. The regulator features ultralow quiescent current and high efficiency over a wide VIN and VOUT range. The step-down regulator operates from an input voltage range of 2.7V to 17V and provides an adjustable output range from 0.6V to VIN while delivering up to 1.25A of output current per channel. LTC3644/LTC3644-2 can be configured for quad 1.25A outputs, triple 2.5A/1.25A/1.25A outputs, dual 2.5A outputs, or dual 3.75A/1.25A outputs. A user selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode® operation provides the highest efficiency at light loads, while forced-continuous mode provides the lowest ripple noise. The regulators can be synchronized to an external clock.

Features

  • Quad Step-down Outputs: 1.25A per Channel
  • Wide VIN Range: 2.7V to 17V
  • Wide VOUT Range: 0.6V to VIN
  • 1.25A/2.5A/3.75A/5A IOUT Configurable withOne Inductor
  • Integrated 300mΩ P-Channel/80mΩ N-ChannelMOSFETs Provide Up to 93% Efficiency
  • No-Load Burst Mode Operation IQ < 10µA with AllChannels Enabled
  • Constant Frequency (1MHz/2.25MHz) with ±50%Frequency Synchronization Range
  • ±1% Output Voltage Accuracy
  • Current Mode Operation for Excellent Line and LoadTransient Response
  • Full Dropout Operation (100% Duty Cycle)
  • Phase Shift Programmable with External Clock
  • 5mm × 5mm × 1.72mm BGA Package

Typical applications

  • Battery Powered Systems, Point-of-Load Supplies
  • Portable – Handheld Scanners and Cameras

More information

Products

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Order Code
Data­sheet
Simu­lation
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Status
Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
fres(MHz)
VOP(V)
Mount
SamplesAvailability & Sample
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74438356033
SPECWE-MAPI SMT Power Inductor, 3.3 µH, 5.15 A

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

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Downloads10 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-MAPI SMT Power Inductor
Inductance3.3 µH
Performance Rated Current5.15 A
Saturation Current @ 30%7.1 A
DC Resistance39.9 mΩ
Self Resonant Frequency26 MHz
Operating Voltage80 V
MountSMT 
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